I’m having trouble solving the following problem. I want to create a workout app where the user can see their workout history and exercise progress. To achieve this, I’m using SwiftData to model the relationship between workouts and exercises in such a way that:

• Exercises are not dependent on workouts.
• Workouts are not dependent on exercises.

Here’s what I have in mind:

import SwiftUI
import SwiftData

@Model
class Workout: Identifiable {
    var name: String
    var id: UUID
    
    @Relationship(deleteRule: .cascade) var relations: [WorkoutExericise]?
    
    init(name: String = "", id: UUID = UUID()) {
        self.name = name
        self.id = id
    }
}

@Model
class WorkoutExericise: Identifiable {
    @Relationship(deleteRule: .cascade, inverse: Workout.relations) var workout: Workout
    @Relationship(deleteRule: .cascade, inverse: Exercise.relations) var exercise: Exercise
    var sets: [ExerciseSet]
    var id: UUID
    
    init(workout: Workout, exercise: Exercise, sets: [ExerciseSet] = [], id: UUID = UUID()) {
        self.workout = workout
        self.exercise = exercise
        self.sets = sets
        self.id = id
    }
}

@Model
class Exercise: Identifiable {
    var name: String
    var id: UUID
    
    @Relationship(deleteRule: .cascade) var relations: [WorkoutExericise]?
    
    init(name: String = "", id: UUID = UUID()) {
        self.name = name
        self.id = id
    }
}

struct ExerciseSet: Codable {
    var reps: Int
    var weight: Float
}

The problem is that this example doesn’t work when deleting a Workout or Exercise that has a relation. Am I overcomplicating things? Or am I just making a mistake? This is my first project with SwiftData.